Ключевые слова: activity, adult, arm, board, challenge, checkerboard, chess, chess pieces, clock, closeup, concentration, curiosity, decisions, equipment, form, game, hand, hobbie, intelligence, leisure, males, match, men, mind, occupation, one, opportunity, outdoor, part, people, piece, pieces, playing, real people, recreational, senior, seniors, sitting, strategy, success, table, thinking, time, touching,